Days and nights are equal throughout the year at:
- (A) Nairobi
- (B) Sydney
- (C) Oslo
- (D) London
- (A) Nairobi
Days and nights are equal throughout the year at the Equator. Because of the Earth’s tilt, the equator gets almost constant sunlight, with about 12 hours of daylight and 12 hours of darkness all year long. Nairobi is near the equator but not directly on it, so it has slight variations. In contrast, Sydney and Oslo are at high latitudes and see major seasonal changes in day length.
When magma reaches the surface it is called:
- (A) Moller magma
- (B) Volcano
- (C) Lava
- (D) Igneous lava
- (C) Lava
When magma reaches the Earth’s surface, it is called lava. Magma is melted rock that exists beneath the Earth’s surface. It forms due to very high temperatures inside the Earth. When this molten rock erupts from a volcano and reaches the Earth’s surface, it is no longer called magma; it is called lava.
- Magma is the term used for molten rock that is located beneath the Earth’s surface.
- Lava is the term for molten rock that has erupted and reached the Earth’s surface.
- Volcano is the opening or vent through which the magma escapes, not the substance itself.
Which star is known as the Constant Star?
- (A) Sirius
- (B) Canopus Star
- (C) North Star
- (D) The Sun
- (C) North star
The North Star, also called Polaris, is often known as the “Constant Star”. It appears to stay in the same spot in the sky all night. While other stars seem to move around the Earth because of its rotation, the North Star is almost directly aligned with Earth’s north celestial pole. This makes it a steady and trustworthy point for navigation and finding direction.
Which area is known as world’s earthquake belt?
- (A) Pacific ring of fire
- (B) Atlantic ridge
- (C) Central-shelf, Egypt
- (D) Sharma-el-Sheikh, Egypt
- (A) Pacific ring of fire
The Pacific Ring of Fire, or Circum-Pacific Belt, is a horseshoe-shaped area that surrounds the Pacific Ocean. It is the most active region in terms of seismic and volcanic activities because of the constant interaction of several tectonic plates.
Which of the following is the physics law of moment?
- (A) The product of clockwise moments is equal to the product of anti-clockwise moments
- (B) The sum of clockwise moments is equal to the sum of anti-clockwise moments
- (C) The total of clockwise moments is equal to one
- (D) The sum of clockwise moments is equal to the sum of all moments
- (B) The sum of clockwise moments is equal to the sum of anti-clockwise moments
The Principle of Moments, or the law of moments, states that an object will remain in rotational equilibrium if the total rotational force in one direction is equal to the total rotational force in the opposite direction. This means that the sum of all the anti-clockwise moments around a pivot will be equal to the sum of all the clockwise moments around the pivot. If these are not equal, the object will not rotate.
Which chemical element has properties of a metal and non-metal?
- (A) Metalloid
- (B) Lanthanoid
- (C) Actinoid
- (D) Graphite
- (A) Metalloid
Metalloids, also known as semimetals, are elements that have properties of both metals and non-metals. They may have a shiny appearance like metals, but they are brittle like non-metals and act as semiconductors rather than conductors, which is similar to non-metals. Silicon, boron, and arsenic are some common examples of metalloids.
Which tube extends from mouth to anus?
- (A) Alimentary canal
- (B) Root canal
- (C) Nasal canal
- (D) Back canal
- (A) Alimentary canal
The digestive tract, also known as the alimentary canal or gastrointestinal tract, is a long muscular tube that extends from the mouth to the anus. In an adult human, the digestive tract is about 9 meters long and consists of the pharynx, esophagus, stomach, small intestine, and large intestine. The primary function of the digestive tract is to process food from the time it is ingested to the time the waste material is eliminated.
Where is the bile stored and intermittently released into the small intestine to aid digestion?
- (A) Kidney
- (B) Liver
- (C) Gall Bladder
- (D) Pancreas
- (C) Gall Bladder
The gallbladder is a pear-shaped sac that is located under the liver and is the primary storage site for bile. Bile is constantly secreted by the liver, but most of it is routed to the gallbladder during fasting, where it is concentrated. When fatty foods enter the small intestine, the hormone cholecystokinin (CCK) is secreted, signaling the contraction of the gallbladder. The contraction propels the bile from the gallbladder through the cystic duct into the common bile duct, from where it flows into the small intestine to emulsify fats.
Blood circulates in which parts of the body?
- (A) Veins
- (B) Arteries
- (C) Capillaries
- (D) All of these
- (D) All of these
The blood travels through a closed system of vessels that runs throughout the body, taking in oxygen and nutrients and picking up wastes as it goes. The blood vessels are composed of three main types of vessels:
- Arteries: These carry oxygen-rich blood away from the heart to the rest of the body.
- Capillaries: These are tiny, thin-walled vessels where the actual exchange of oxygen, nutrients, and waste products occurs between the blood and body tissues.
- Veins: These carry oxygen-poor blood back toward the heart to be refilled with oxygen in the lungs.
Which blood group is a “universal donor”?
- (A) Group A
- (B) Group AB
- (C) Group B
- (D) Group O negative
- (D) Group O negative
Individuals with O negative blood are referred to as universal donors. This is because their red blood cells do not have three things: A antigens, B antigens, and Rh factor (negative). This is why O negative blood can be transfused to patients with blood groups A, B, AB, or O, whether positive or negative.